| 摘要 |
PROBLEM TO BE SOLVED: To absorb a wide range of frequency band of vibration by providing a main liquid room having an expandable shrinkable elastic separating film, an expandable shrinkable sub-liquid room communicating with the main liquid room, an elastic deforming film composing a separating film, and an air room which is disposed opposite to the main liquid room with the elastic film therebetween. SOLUTION: When a vehicle shakily vibrates, an elastic film 104 is nonlinearly deformed and liquid goes between a main liquid room 32 and a sub-liquid room 34 through a restriction passageway 52 and absorbs vibration with resistance thereof. When the vehicle idly vibrates, the restriction passageway 52 becomes in a clogging state and liquid goes between a main liquid room 32 and a sub-liquid room 70 through a restriction passageway 46 and resonates within the restriction passageway 46. When a control circuit 60 judges by a vehicle speed sensor 98 and number of revolution of engine sensor 99 that vibration frequency is lower, it makes an air room 74 communicate with open air and reduce the rigidity of a diaphragm 68, thereby absorbing idle vibration of low frequency. When a control circuit 60 judges that vibration frequency is higher, it makes an air room 74 close for open air and increase the rigidity of a diaphragm 68, thereby absorbing idle vibration of high frequency. |
